How do I save a route map?

My question is basic. I want to save directions (that is, a route map) and access the map from all devices on which I have Google Maps / Earth installed (PC, Droid, iPad). This seems elementary to me, and I know that one at least has been saved, but so far I see no consistent and readily availble 'save this for later use' command.. (I will want to do the same with Tracker and with the AlpineQuest app). Please advise. thanks